Question

A body travels 10 meters during the first 5 seconds of its travel, and it travels a total of 30 meters over the first 10 seconds of its travel What i
average speed during the time from t=5 seconds tot 10 seconds?
A.
B.
2 meters/second
3 meters/second
C.
4 meters/second
D.
5 meters/second
E.
6 meters/second

Answer 1

Answer:

$\large \boxed{\text{C. 4 m/s}}$

Explanation:

At 5 s the body has travelled 10 m.

Between 5 s and 10 s, the body reached 30 m.

Distance travelled = 30 m - 10 m = 20 m

Time = 10 s - 5 s = 5 s

$\text{Speed} = \dfrac{\text{ distance}}{\text{time}} = \dfrac{\text{20 m}}{\text{5 s}} = \textbf{4 m/s}\\\\\text{The average speed between 5 s and 10 s is \large \boxed{\textbf{4 m/s}} }$